I have a 2007 F250 4x4, yesterday me and the Fam went up to the snow. put it in 4 high and then later 4 low everything worked great. When we were done the truck would not come out of four-wheel-drive , Stuck in 4 low. No matter what I did nothing worked . I ended up taking the actuator motor off of the transfer case and manually putting it into 2 wd. Worked on it today and found the 4x4 relays and they were mounted up side down next to the battery driver side the relay cover acted as a pool for water to collect in. Took the relays apart and they were so corroded they had to be replaced. I pulled the little tab and popped the relay box out and flipped it right side up and it snapped right back in almost as if it was accidentally put upside down from the factory. I've had the truck since brand-new and I've never taken it to have any work done to it that might have caused that to happen. anyone else have this experience? Here is a picture.

Yes . Replacing both relays got it working again. You can try swapping them first. they are the same. They are also the same as the horn and wiper relays under the dash. Just found that out today. One is for engaging the transfer case, the other is to disengage. probably best to change them both. If one is bad the other is probably not far behind.

Odd how threads get started at just the right time. I wrapped a strap around a stump this past Saturday and backed up to it, selected 4 low and out she came. Then I sat in the backyard all afternoon stuck in low range. I finally got it to shift and I kinda forgot about it....until now. I'll check relays tomorrow. What ever happened to a stick in the floor?

I agree.I prefer the old floor shift too but I bought mine used. It is what it is. It does seem like a pretty delicate set up for such a Heavy Duty truck though. If I was ordering a new one I would opt for the lever. Good luck getting yours working.

No problem guys hope it helps some one. @ snake, doesn't look like it could have happened with a battery replacement, looked like it was put on upside down from the factory the wires were coming out of the top and the relays were facing straight down yet the relay housing was snapped securely into the bracket and the cover was holding water submerging the relays. I simply unclip the relay housing pulled it off of the bracket and reinstalled it the correct way. Haven't put the new relays in yet to see if it works but I'm pretty sure it will.

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